JP6669690B2 - Lighting equipment - Google Patents

Description

  The present invention relates to a lighting device that mainly illuminates the outdoors.

  Lighting devices that are installed at a certain height, such as road lights, street lights, and parking lot lights, and illuminate a wide area to a distant place (such lighting devices intended for outdoor use are referred to as "outdoor lights" Can be used indoors.), It is required to illuminate a predetermined range with a certain level of brightness or more. On the other hand, there is a conflicting demand to suppress glare when looking directly at the light source.

  The LED light source generally has the highest luminous intensity in the optical axis direction. Therefore, in the case of an outdoor light that needs to illuminate a wide range up to a distant place, it is common to design the optical axis so as to face the far side. In the tunnel lighting device described in Patent Literature 1, the mounting angle is inclined about 30 degrees from directly below, and a reflector is installed before and after the LED module to achieve a horizontally long light distribution, and an opening is formed in the rear-side reflector. It is described that it is provided. Patent Literature 2 discloses a street light, which includes a combination of a rearward light source whose optical axis is directed backward 35 degrees and a forward light source whose optical axis is directed forward 35 degrees. It illuminates the rear reflecting surface attached to the light source, is reflected forward, and the amount of irradiation of the rearward light source is larger than the amount of irradiation of the frontward light source.

JP-A-2006-015227 JP-A-2005-38826

  In an outdoor lamp using a conventional general LED light source, the direction of the optical axis at which the emission angle distribution of the LED light source is maximum is generally directed to a portion of the irradiation range that is far from the installation position. Obviously, when viewing the light source from a person at that position, the light source is viewed from the front, and the user feels glare.

  Further, the outdoor light can be efficiently illuminated far away by tilting the light emitting surface obliquely from below as in the lighting device described in Patent Literature 1. There is a problem that the light emitting surface may be damaged by the collision. Note that the lighting device described in Patent Literature 1 assumes that the installation location is inside a tunnel, so that the influence of a strong wind can be ignored.

  The present invention has been made in view of such circumstances, and in an outdoor light, by setting the optical axis direction of the light source to a position immediately below, when a person on the illuminated surface directly looks at the lighting device. The purpose of the present invention is to reduce the glare of light and to make light reach far.

  In order to solve the above-described problems, an illumination device according to the present invention is an illumination device that illuminates an irradiated surface from a position distant from the irradiated surface, and includes a light source having a light emitting region, and a light source having a light emitting region, and standing upright behind the light source. A rear reflector that reflects light emitted from the light source, the rear reflector having an upright angle that covers at least a part of a virtual region extending the light emitting region in the optical axis direction of the light source. The optical axis direction is at an angle of not less than -10 degrees and not more than 10 degrees with respect to the normal direction of the irradiated surface.

  According to the invention of the present application, since the light from the light source can be radiated diagonally forward while the optical axis of the light source is directed substantially directly below, the glare in the right below or in the left-right direction (Y direction) can be suppressed. It is possible to illuminate a relatively wide area brightly.

FIG. 2 is a cross-sectional view of the lighting device according to the first embodiment. FIG. 2 is a bottom view of the lighting device according to the first embodiment. It is an example of installation of the lighting installation concerning a 1st embodiment. It is a figure showing a light ray in the section of the lighting installation concerning a 1st embodiment. It is the figure which looked up at the lighting device which concerns on 1st Embodiment from 45 degree front. 5 is an illuminance distribution of the ground illuminated by the illumination device according to the first embodiment. It is a sectional view of a lighting installation concerning a 2nd embodiment. It is sectional drawing of the illuminating device which concerns on 3rd Embodiment. It is sectional drawing of the illuminating device which concerns on 4th Embodiment. It is a sectional view of a lighting installation concerning a 5th embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

<Lighting device>
FIG. 2 is a bottom view of the lighting device 1 according to the first embodiment of the present invention viewed from below, and FIG. 1 is a cross-sectional view of the lighting device 1 taken along line AA of FIG. FIG. 3 shows an example in which the lighting device 1 is installed at a height H (H is, for example, 4.64 m) from an irradiated surface 90 (specifically, the ground) using a pole 80. As described above, the illumination device 1 is suitably used, for example, as an outdoor lamp that illuminates the surface to be illuminated below the pole and the person 92 or the object thereon. In the present application, as shown in FIG. 3, the direction away from the pole in the X direction is denoted by F, and the direction closer to the pole than the lighting device 1 is denoted by R.
As shown in FIGS. 1 and 2, the lighting device 1 includes a housing 10, a hood 20, light sources 31 and 32, holders 41 and 42, reflecting mirrors 61 and 62, a power supply unit 50, and a mounting unit 70.

  The housing 10 is a member having a box shape whose one surface is open. The housing 10 has a bottom portion 11 which is a flat surface having a step, and side wall portions 12 which are provided upright before and after the bottom portion 11. A radiation fin 15 is provided between the upper surface of the housing 10 and the outline of the lighting device 1.

  The hood 20 is a member having light transmissivity and covering the opening of the housing 10. The hood 20 is fixed to the side wall 12. The hood 20 of the present embodiment is curved so as to be convex in a direction opposite to the bottom surface portion 11. A reflecting mirror 61 and a reflecting mirror 62 are provided inside a space formed by the housing 10 and the hood 20. Thereby, it is possible to prevent the light sources 31 and 32 and the reflecting mirrors 61 and 62 from being exposed to wind, rain and dust. A higher transmittance of the hood 20 for straight-forward light is preferable from the viewpoint of delivering light to a distant place. (Increase the haze value).

The light sources 31 and 32 are installed on the bottom surface 11 of the housing 10 using holders 41 and 42, respectively. The holders 41 and 42 have contacts for controlling the power supplied from the power supply unit 50 and sending the power to the light sources 31 and 32.
Note that COB (Chip On Board) type LEDs are employed as the light sources 31 and 32 of the present embodiment. This is an LED in which a large number of LED chips installed on a board are sealed with a sealing resin, and light from the LED chips and light emission of a phosphor contained in the sealing resin are preferably combined. It is a white or bulb color LED that emits light. In the present embodiment, a COB-type LED having a light-emitting region made of a sealing resin having a diameter of, for example, 16 mm is used. However, the light emitting area is not limited to a circle, but may be a rectangle or the like, and the light sources 31 and 32 may be LEDs other than the COB type. The light sources 31 and 32 need only emit light by the supplied electric power, and for example, a light source other than the LED may be employed.

  A front reflecting mirror 61F and a rear reflecting mirror 61R of the reflecting mirror 61 are erected before and after the light source 31, and a front reflecting mirror 62F and a rear reflecting mirror 62R of the reflecting mirror 62 are erected before and after the light source 32. .

  The light sources 31 and 32 have the directional characteristics of the emission intensity distribution, and the direction in which the intensity is maximum is the optical axis direction. Since the light sources 31 and 32 used in the present embodiment have isotropic directivity characteristics, the Z direction in FIG. 1 is the optical axis direction.

  Light rays emitted in both directions from the both ends of the light emitting area 31L of the light source 31 in the Z direction are 1A and 1B, and light rays emitted in both directions from the both ends of the light emitting area 32L of the light source 32 are 2F and 2R. The light beams 1B and 2B are reflected by the rear reflecting mirrors 61R and 62R, respectively, and are emitted obliquely and laterally. The light beams 1A and 2A are emitted in the Z direction without being reflected by the reflecting mirror.

  The power supply unit 50 is housed inside the mounting unit 70. The power supply unit 50 may be of a battery type or may be connected to an external power supply. The power supply unit 50 and the holders 41 and 42 are connected via a wiring 51 (not shown).

The mounting portion 70 is a member for mounting the housing 10 of the lighting device 1 to the pole 9. The mounting portion 70 has a frame and a hollow box-shaped member fixed to the frame. Referring to FIG. 2 which is a front view, mounting fixture 71 rotatably supports mounting section 70 and housing 10. Thus, by rotating the housing 10 with respect to the fixture 71, the installation angle of the housing 10 with respect to the irradiated surface can be adjusted, and the angle of the direction of illumination light irradiation with respect to the irradiated surface can be adjusted. As the angle adjustment range of the housing 10, the angle between the Z direction that is the optical axis direction from the light sources 31 and 32 in FIG. 1 and the E direction that is the normal direction of the irradiated surface is θ _z (0 degree). If the angle is from minus 10 degrees to plus 10 degrees, unnecessary light traveling toward the rear of the lighting device 1 does not increase so much and glare in the front does not increase. For example, the illumination distribution is almost the same as the illumination distribution designed at 0 degrees, which is more preferable.

<Reflector>
As shown in FIG. 1, the reflecting mirror 6 is formed by integrating a reflecting mirror 61 and a reflecting mirror 62. The reflecting mirror 61 includes a front reflecting mirror 61F and a rear reflecting mirror 61R. The reflecting mirror 62 includes a front reflecting mirror 62F. And a rear reflector 62R. The front reflecting mirror 61F has a tip inclined forward at an erect angle (an angle from a direction perpendicular to the Z axis) θ _1F = 40 °, and transmits light traveling in a lateral direction from the optical axis in the optical axis direction (after installation). (Downward). Meanwhile back reflection mirror 61R is tip theta _{1R = 104} ° (angle from the direction perpendicular to the Z-axis) standing設角is tilted forward (Note: theta _1R is the tip equal to or smaller than 90 degrees inclined rearwardly ), The light-emitting region partially covers a virtual region extending in the Z-axis direction. Therefore, at least a part of the light vertically emitted from the light emitting region is reflected forward by the rear reflector 61R. Thereby, unnecessary light traveling backward is suppressed. The front reflector 62F and the rear reflector 62R are the same as the front reflector 61F and the rear reflector 61R, respectively. Note that the values of θ _{1F and} θ _1R are merely examples, and for example, may be within ± 5 degrees from these values, and more preferably within ± 3 degrees.

  In addition, as shown in FIG. 1, since the installation surfaces of the light sources 31 and 32 are different by D = 2 mm, there is an effect that the light emitted from the light source 31 is less likely to be blocked by the reflecting mirror 62R. Due to the difference in the installation surfaces, the front reflector 61F and the front reflector 62F, and the rear reflector 61R and the rear reflector 62R are slightly different in size.

The reflecting mirror 6 has substantially the same cross-sectional shape in any of the cross sections in the Y direction (left-right direction) in FIG. Thereby, the reflecting mirror 6 can be easily manufactured.
The reflecting mirrors 61 and 62 are resin moldings, and each reflecting mirror is formed with a reflecting film. The reflection film is formed by, for example, metal plating such as Al (aluminum) or a vapor deposition film of a metal such as Al. However, the reflection film may be formed by another method. The reflecting mirrors 61 and 62 may be made of a material other than resin, for example, a metal coated with a transparent film. Further, the front reflecting mirror 61F and the rear reflecting mirror 61R may be formed of the same member or may be formed of different members, respectively, and the front reflecting mirror 61F, the rear reflecting mirror 61R, the front reflecting mirror 62F, and the rear reflecting mirror are provided. 62R may be constituted by the same member. If the front reflecting mirror 61F and the rear reflecting mirrors 61R, 62F, 62R are made of the same member, a single mold can be used, and processing costs can be reduced. Further, if the front reflecting mirror 61F, the rear reflecting mirror 61R, the front reflecting mirror 62F, and the rear reflecting mirror 62R are separate members, the reflecting mirror can be appropriately selected according to an illumination target or an illumination area, and the positional relationship between the respective reflecting mirrors Can be changed according to the situation.

  The reflection film formed on the front reflection mirror 61F, the rear reflection mirror 61R, the front reflection mirror 62F, and the rear reflection mirror 62R is preferably a mirror reflection film, or a mirror reflection mirror that has been subjected to facet processing or dimple processing. By performing the facet processing and the dimple processing, the reflection direction of the light beam is not largely changed but slightly expanded.

<Effect of reflecting mirror>
FIG. 4 shows a simulation result of light rays in a cross section (substantially the same cross section as FIG. 1) of the illumination device 1 according to the present embodiment. It can be seen that the light is directed diagonally forward in the P direction as a whole by the functions of the front reflector 61F, the rear reflector 61R, the front reflector 62F, and the rear reflector 62R.

  FIG. 2 shows a case where the lighting device 1 according to the present embodiment is looked up from below. It can be seen that the light sources 31 and 32 are shielded about half by the rear reflectors 61R and 62R. That is, the amount of light reaching the lower side is about half as compared with the case where the rear reflecting mirrors 61R and 62R are not provided. Since the front reflecting mirror 61F, the rear reflecting mirror 61R, the front reflecting mirror 62F, and the rear reflecting mirror 62R are formed by bending a flat plate, they have substantially the same shape in the Y direction (left-right direction) in FIG.

  On the other hand, FIG. 5 shows a case where the lower surface of the lighting device 1 according to the present embodiment is looked up from 45 degrees ahead (F direction). The light sources 31 and 32 can be seen directly, and the light source images 31M and 32M reflected by the rear reflectors 61R and 62R can be seen. Therefore, the amount of light reaching obliquely forward increases, and the light can be effectively guided to the front where the amount of light is required.

<Illuminance of irradiated surface>
FIG. 6 is a simulation result of the illuminance distribution on the illuminated surface when the present illumination device 1 is used. The lighting device 1 is installed at a height of 4.64m from point C, the angle theta _Z of the lighting device 1 with respect to the illuminated surface vertical optical axis 0 °, the total luminous flux is 7353lm.

From the illuminance distribution, it can be seen that the illuminance of 1.5 lx can be secured even 15 m ahead of the position of the lighting device 1. Despite the angle θ _Z of the optical axis of the lighting device 1 with respect to the irradiated surface being 0 ° and dazzling being suppressed, the illuminance is suppressed behind the lighting device 1 (in the R direction), and unnecessary light or It has the advantage that the amount of light that causes light pollution is small.

<Example in which only the first light source is provided>
FIG. 7 is a cross-sectional view of a lighting device 101 according to the second embodiment of the present invention. The lighting device 101 includes a housing 110, a radiation fin 115, a hood 120, a light source 131, a holder 141, a power supply unit 150, a reflecting mirror 161 including a rear reflecting mirror 161R and a front reflecting mirror 161F and a reflecting mirror extension 165, and mounting. It has a part 170. The power supply unit 150 is located at a portion covered by the hood 120 and is covered by the reflector extension 165.

  The front reflector 161F and the rear reflector 161R that constitute the reflector 161 have the same shape as the rear reflector 61F and the front reflector 61R, respectively.

  Light rays emitted from both ends of the light emitting region 131L of the light source 131 in the Z direction are defined as 1A and 1B. The light ray 1B is reflected by the rear reflecting mirror 161R and emitted obliquely and sideways. The light beam 1A is emitted in the Z direction without being reflected by the reflecting mirror.

<Example of changing the angle of the rear reflector>
FIG. 8 is a sectional view of a lighting device 201 according to the third embodiment of the present invention. The only difference from the illuminating device 101 is that the angle of the rear reflector is changed so that all the light rays 1A and 1B traveling straight in the Z direction from the light emitting area 131L of the light source 131 are obliquely reflected by the rear reflector 261R. Therefore, the element numbers used in the other embodiments are used as the element numbers.
As a result, there is no light traveling straight from the light source 131 in the Z direction, and the glare at the position directly below and in the horizontal direction (Y direction of the irradiated surface) is reduced.

<Example without front reflector>
FIG. 9 is a cross-sectional view of a lighting device 301 according to the fourth embodiment of the present invention. The only difference from the illumination device 201 is that the front reflector 161F is eliminated, and the element numbers used in the other embodiments are diverted.
As a result, the “light beam 1G” is radiated obliquely in the horizontal direction, and the light radiated diagonally forward increases as compared with the third embodiment.

  Similar effects can be obtained even if the height of the front reflector is not completely eliminated as in the present embodiment but is reduced.

<Example in which the reflecting mirror is a curved mirror obtained by bending a flat plate in one direction>
FIG. 10 is a sectional view of a lighting device 401 according to the fifth embodiment of the present invention. The difference from the illumination device 101 according to the second embodiment is that the illumination device 101 includes a reflector 461 composed of a rear reflector 461R and a front reflector 461F and a reflector extension 465, and has a cross-sectional shape of the front reflector 461F and the rear reflector 461R. Is a curved surface. Therefore, the reflection direction of the light beam 4B emitted from the rear end of the light emitting area of the light source 131 in the optical axis direction changes. The light beam 4A emitted in the optical axis direction from the front end of the light emitting region of the light source 131 is not reflected by any of the reflecting mirrors, and therefore has the same direction as the light beam 1A. For other element numbers, those used in other embodiments are used.
The “standing angle” in the optical sense is to be defined in each part of the rear reflecting mirror 461R and the front reflecting mirror 461F, but as an “average standing angle”, a virtual connecting the base and the tip of the reflecting mirror. Defines the angle of the plane perpendicular to the optical axis direction to the line. The front reflecting mirror 461F has a tip inclined forward at an average standing angle θ _1FAV = 40 °, which is an angle formed between the direction perpendicular to the optical axis and the imaginary line 461FAV. It works to bring the part closer to the optical axis direction (downward direction after installation). On the other hand, the rear reflecting mirror 461R has a tip inclined forward at an average standing angle (angle from the direction perpendicular to the Z axis) θ 1 _{RAV =} 104 °, which is an angle formed between the direction perpendicular to the optical axis and the imaginary line 461RAV. And partially covers a virtual region obtained by extending the light emitting region in the Z-axis direction. Also theta _1FAV the average elevation _設角, the value of theta _1RAV is one example, for example may be within plus or minus 5 degrees from these values, more preferable if it is within plus or minus 3 degrees.
Although the rear reflector 461R and the front reflector 461F have concave cross sections, the rear reflector may be concave or the front reflector may be flat or convex, and the rear reflector may be flat or convex and the front anti-reflector may be concave. Is also good.
According to the present embodiment, the cross-sections of the reflecting mirror 461 and the reflecting mirror extension 465 having different cross sections in the Y direction are almost the same, that is, the flat plate is curved in one direction. Therefore, it has an advantage that it can be easily manufactured.

<Other modifications>
As described above, the main embodiment of the present invention has been described, but the present invention is not limited to the above embodiment.

  In the above-described embodiment, the illumination device is an outdoor lamp installed on a pole and illuminating the ground, which is a surface to be irradiated. However, the lighting device of the present invention is not limited to this, and may be a lighting device that illuminates, for example, a warehouse or an indoor stadium.

  In the above-described embodiment, the light source is a COB having a constant light emitting region. However, even if the effective light emitting region is changed by combining an optical system such as a lens or a diffusing member in the vicinity of the light source. Good. Further, instead of COB, an LED element combined with a dome lens may be used.

  Further, in the above-described embodiment, the light source of the lighting device is configured by one or two light sources. However, the light source of the lighting device of the present invention may be, for example, one provided with two or more light sources in the X direction and two or more light sources in the Y direction. The front reflecting mirror and the rear reflecting mirror standing upright and rearward of each light source may have the same angle and height, or may have different angles and heights.

  Further, in the above-described embodiment, the reflecting mirror which stands upright in the cross section in the Y direction is not provided, but it may be provided, and it is integrated with the front reflecting mirror and the rear reflecting mirror to surround the light source. It may be a reflecting mirror provided so as to surround it.

  When the present lighting device is used as an outdoor light, the surface to be irradiated may be a horizontal plane or a virtual horizontal plane. When the present lighting device is installed on an inclined surface, for example, the angle between the lighting device and the optical axis with respect to the irradiated surface may be calculated with respect to a virtual horizontal plane.

  In addition, the elements appearing in each of the above embodiments and modifications may be arbitrarily combined as long as no inconsistency occurs.

<Extraction of invention>
The inventions extracted from the above embodiments and modifications include, for example, the following inventions.

  The present invention is a lighting device installed at a position distant from a surface to be illuminated and illuminating the surface to be illuminated. A rearward reflecting mirror that has an upright angle that covers at least a part of a virtual region extending the light emitting region in the optical axis direction of the light source, and the optical axis direction is the light receiving direction. The angle is not less than -10 degrees and not more than 10 degrees with respect to the normal direction of the irradiation surface. Thereby, glare when a person on the surface to be illuminated directly looks at the illumination device can be reduced. This also reduces unnecessary light traveling backward.

In the present invention, the rear reflector may be a flat surface or a curved surface obtained by bending a flat plate in one direction. This makes it possible to easily manufacture the rear reflector while suitably spreading light in the Y direction.
In the present invention, a front reflecting mirror provided near the light source and reflecting light emitted from the light source may be provided, and the front reflecting mirror may have a tip inclined in a direction away from the optical axis. Thereby, light can be effectively used by increasing the light illuminating the front of a certain range of the irradiation target surface and decreasing the light illuminating a farther place further away.

  In the present invention, the front reflector and the rear reflector may be the same member. Thereby, the front reflecting mirror and the rear reflecting mirror can be manufactured at the same time, and the alignment of both becomes unnecessary.

In the present invention, two or more light sources may be arranged in the front-back direction (X direction) or the left-right direction (Y direction). Thereby, the light amount can be adjusted appropriately.
In the present invention, the installation positions D of the light sources arranged in the front-rear direction may be slightly changed. Thereby, it is possible to reduce the light loss of the light source installed particularly behind.

  In addition, effects of the invention other than the effects described here may occur.

1, 101, 201, 301 Illumination device 10, 110 Housing 11 Bottom part 12 Side wall part 20, 120 Hood 31, 32, 131 Light source 31M, 32M Light source image 41, 42 Holder 50, 150 Power supply unit 6 Reflecting mirror 61 1st reflector 62 Second reflectors 61F, 62F, 161F, 461F Front reflectors 61R, 62R, 161R, 261R, 461R Rear reflector 70 Attachment part 71 Attachment 80 Pole 90 Illuminated surface 92 persons

Claims (5)

An illumination device that illuminates an irradiated surface from a position away from the irradiated surface,
A COB-type light source having a light-emitting area, and a rear reflector that is provided upright behind the light source and reflects light emitted from the light source rather than partially,
The rear reflector, not covered part of the virtual area to which the tip is extended the light emitting region in the direction of the optical axis of the light source,
The lighting device, wherein the optical axis direction is at an angle of not less than -10 degrees and not more than 10 degrees with respect to a normal direction of the irradiated surface .   The lighting device according to claim 1, wherein the rear reflector is a flat surface or a curved surface obtained by bending a flat plate in one direction. A front reflecting mirror is provided near the light source and reflects light emitted from the light source, and the front reflecting mirror has a tip inclined in a direction away from the optical axis.
The lighting device according to claim 1. The front reflector and the rear reflector are the same member,
The lighting device according to claim 3. The plurality of light sources are arranged in front and rear or left and right,
The lighting device according to claim 1.